AHMED, O S and DUTTA , D K (2005) FRIEDEL-CRAFTS BENZYLATION OF BENZENE USING ZN AND CD IONS EXCHANGED CLAY COMPOSITES. J Molecular Catalysis A-CHEMICAL, 229 (1-2). pp. 227-231.

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Abstract

Metal ion-exchanged clay composites such as MII–Mont and MII–Mont (AT) where M=Zn and Cd, Mont=montmorillonite clay of the typesMont1(SWy-2)andMont2(Neelkanth),andAT=acidtreatedhavebeensynthesized,characterizedandevaluatedascatalystsforFriedelCraftsreactionparticularlyforbenzylationofbenzene.XRDstudyrevealsthat,ingeneral,thebasalspacing(d001)increasesastheinterlayer cations of Na–Mont or H+–Mont are exchanged with Zn2+ or Cd2+ ions and interlamellar spacings are maintained in the range 3.9–5.3 and 4.3–6.0 ˚A, respectively, at room temperature. The basal spacing (d001) of Mont1 supported composites are higher than Mont2 and therefore substantiatetheadvantageoftheformeroverthelatterinpreparingmetalion-exchangedclaycompositesusefulassolidacidcatalysts.During theinitialbenzylationreactions,Cd2+-exchangedcomposites,ingeneral,showhigheractivitybutinthelongrunZn2+-exchangedclaysexhibit highercatalyticactivities.Ingeneral,acidtreatedmetalion-exchangedclaycompositesexhibithighercatalyticactivitythannon-acidtreated ones because the former show higher surface area as well as higher acid sites. © 2004 Elsevier B.V. All rights reserved.

Item Type:	Article
Subjects:	Chemistry > Material Science
Divisions:	UNSPECIFIED
Depositing User:	Dr. PK Barooah
Date Deposited:	05 Jan 2012 05:58
Last Modified:	05 Jan 2012 05:58
URI:	http://neist.csircentral.net/id/eprint/299

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